Nuno Marques defeated Martin Bartonek 6-4 6-3 in the Portugal 5 Masters 3 round of 16 on clay. The upset overturned the form book — Martin Bartonek came in leading the head-to-head 1–0. Nuno Marques claimed a first win over Martin Bartonek in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-11-22 | Portugal 5 Masters 4 | SF | clay | Martin Bartonek | 7-5 4-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.